Accession Number : AD0757302

Title :   Voice and Hearing in the System of Acoustic Orientation of Animals,

Corporate Author : DEFENCE RESEARCH INFORMATION CENTRE ORPINGTON (ENGLAND)

Personal Author(s) : Ilichev,V. D.

Report Date : FEB 1973

Pagination or Media Count : 23

Abstract : The general rules determining the interrelation of acoustic systems in various systematic groups and at various levels of evolution were examined. The acoustic organs sometimes do not reveal homologous successions, and their evolution, from the structural point of view, bears a mosaic character. At the same time, functional characteristics of hearing and voice and the interrelation between them reveal clear changes in the following directions: (a) in the sphere of sound communication, more and more vital situations are involved, (b) the functional (dynamic) range is widened, (c) the acoustic systems are universalized and their numbers are decreased. The interrelations of the voice and hearing are considered as a biological correlation of a special type, guaranteeing organismic, populational and biocoenotic channels of interrelation. In various systematic groups in relation to the use of sounds in specific ecology, these or other channels acquire a decisive significance. (Author)

Descriptors :   (*ACOUSTICS, ANIMALS), (*ACOUSTIC SIGNALS, ANIMALS), SENSE ORGANS, HEARING, VOICE COMMUNICATIONS, ECOLOGY, USSR

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE